Re: [APML] Orion Short Tube 80

["Frank Barrett" <frankb@celestialwonders.com>]

Nicola,

I appreciate the confirmation.  If I go this route I'll be sure to get a
minus violet filter.
----- Original Message -----
From: "Takoyaki" <nmontec@libero.it>
To: "Discussion of Film Astrophotography" <astro-photo@seds.org>
Sent: Monday, October 20, 2003 3:25 PM
Subject: Re: [APML] Orion Short Tube 80


> Hi Frank,
>
> I personally do not own one, but from what I've heard, fast f/ratio
achromat
> suffer quite seriously from blue region being out of focus so you
definetely
> need a "minus violet" like filtre.
> >From a vignetting point of view than I'm sorry but can't help you much in
> that. Hope someone else can give us some info regarding that.
>
> cheers
> Nicola
> ----- Original Message -----
> From: Frank Barrett
> To: Astro-Photo@seds.org
> Sent: Monday, October 20, 2003 7:40 PM
> Subject: [APML] Orion Short Tube 80
>
>
> Does anyone on the list use the Orion Short Tube 80 for AP?  Any problems
> with vignetting on a 35mm frame?  As an achromat would I need a minus
violet
> filter for film?
>
> TIA,  Frank
> http://celestialwonders.com
>
>
>
>
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